CN102035581A - Radio communication device, radio communication system, and radio communication method - Google Patents
Radio communication device, radio communication system, and radio communication method Download PDFInfo
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- CN102035581A CN102035581A CN2010102895338A CN201010289533A CN102035581A CN 102035581 A CN102035581 A CN 102035581A CN 2010102895338 A CN2010102895338 A CN 2010102895338A CN 201010289533 A CN201010289533 A CN 201010289533A CN 102035581 A CN102035581 A CN 102035581A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
Abstract
Disclosed are a radio communication device, a radio communication system, and a radio communication method. The radio communication device includes a plurality of leaky coaxial cables that transmit and receive radio signals, a detection unit that detects a difference in reception timing of a radio signal transmitted from another radio communication device among the plurality of leaky coaxial cables, and a transmission timing adjustment unit that adjusts transmission timing of radio signals to be respectively transmitted from the plurality of leaky coaxial cables based on the difference in the reception timing detected by the detection unit.
Description
Technical field
The present invention relates to radio communications set, radio communications system and radio communication method.
Background technology
Recently, use MIMO (multiple-input and multiple-output) that a plurality of antennas communicate between radio communications set and the OFDM (OFDM) that has utilized the orthogonality of frequency by active research.
Because the antenna of each the antenna distance receiving terminal in a plurality of antennas of transmitting terminal has different paths, so when a plurality of antennas of transmitting terminal sent radio signal simultaneously, the reception of the antenna of receiving terminal timing is difference along with the difference of the antenna of the transmitting terminal of radio signal.Aspect interference avoids, receive difference regularly and preferably be in the OFDM protection scope at interval.Notice that a kind of technology that is used for reducing receiving difference regularly is disclosed at the open No.2006-270880 of Japanese unexamined patent.
On the other hand, a kind of mode by the complete covering chamber of Wireless LAN system inner region can be to place a plurality of base stations in the mode of dispersed placement, and lays leakage coaxial cable etc.
Summary of the invention
Yet under the situation that a plurality of leakage coaxial cables is laid on the radio communications set that is used for MIMO communication, the path between the antenna of each leakage coaxial cable and receiving terminal is different greatly.Therefore, the antenna of receiving terminal is also very big to the reception difference regularly of the radio signal that sends from each leakage coaxial cable.Notice that if a plurality of leakage coaxial cable is placed by bunchy, then the difference of the path between the antenna of each leakage coaxial cable and receiving terminal will become smaller; Yet, when leakage coaxial cable mutually near the time, the characteristic of MIMO communication is by deterioration, this will cause the reduction of throughput.
In view of above problem, expectation provide a kind of can adjust in a plurality of leakage coaxial cables each leakage coaxial cable to the transmission of radio signal novelty regularly, improved radio communications set, radio communications system and radio communication method.
According to embodiments of the invention, a kind of radio communications set is provided, comprising: a plurality of leakage coaxial cables that send and receive radio signals; Detect between a plurality of leakage coaxial cables the detecting unit of transmission from the reception difference regularly of the radio signal of another radio communications set; And receiving regularly poor based on detecting unit is detected, the transmission transmission regularly of adjusting the radio signal that will be respectively sends from a plurality of leakage coaxial cables is adjustment unit regularly.
Send regularly adjustment unit and can adjust in such a way and send regularly, that is, make that in this another radio communications set the reception difference regularly to the radio signal that will be respectively sends from a plurality of leakage coaxial cables is in the preset range.
Transmission timing adjustment unit can be adjusted in such a way to send and decide; that is, make in this another radio communications set the reception difference regularly to the radio signal that will be respectively sends from a plurality of leakage coaxial cables be in the protection interlude scope that is added into each OFDM symbol.
Send regularly adjustment unit and can adjust in such a way and send regularly, promptly the reception to the radio signal that will be respectively sends from a plurality of leakage coaxial cables is regularly consistent with each other in this another radio communications set.
Radio communications set can be carried out the antenna calibration of another radio communications set therewith, and in antenna calibration, based on coming the response of another radio communications set since then, calibrating signal is sent in proper order from a plurality of leakage coaxial cables, and detecting unit can detect and receive regularly poor based on coming the response in response to the calibrating signal that sends in proper order from a plurality of leakage coaxial cables of another radio communications set since then.
Radio communications set can comprise the lock unit of detection by each synchronization timing of the received signal of a plurality of leakage coaxial cables receptions.Detecting unit can detect poor by the synchronization timing of the detected received signal of lock unit, as receiving regularly poor.
Radio communications set can comprise the reception adjustment unit regularly that is supplied to the timing of lock unit based on detected each that receives in the received signal that difference adjustment regularly will receive by a plurality of leakage coaxial cables of detecting unit.
According to another embodiment of the invention, provide a kind of radio communications system, having comprised: first radio communications set that comprises a plurality of antennas; And comprise second radio communications set: a plurality of leakage coaxial cables that send and receive radio signals with the lower part; Detect between a plurality of leakage coaxial cables the detecting unit of transmission from the reception difference regularly of the radio signal of first radio communications set; And receiving regularly poor based on detecting unit is detected, the transmission transmission regularly of adjusting the radio signal that will be respectively sends from a plurality of leakage coaxial cables is adjustment unit regularly.
According to another embodiment of the invention, provide a kind of radio communication method, may further comprise the steps: received the radio signal that sends from another radio communications set by a plurality of leakage coaxial cables; Detect between a plurality of leakage coaxial cables regularly poor of the reception of radio signal; And regularly based on the transmission that receives the radio signal that difference adjustment regularly will be respectively sends from a plurality of leakage coaxial cables.
Embodiment according to the present invention as described hereinbefore, can adjust in a plurality of leakage coaxial cables each leakage coaxial cable to the transmission of radio signal regularly.
Description of drawings
Fig. 1 is the key diagram that illustrates according to the configuration of the radio communications system of the embodiment of the invention.
Fig. 2 is the functional block diagram that the configuration of the base station relevant with the present invention is shown.
Fig. 3 illustrates the key diagram of the radio communications set relevant with the present invention from the radio signal of each leakage coaxial cable reception of base station.
Fig. 4 is the functional block diagram that illustrates according to the configuration of the base station of the embodiment of the invention.
Fig. 5 is the key diagram that leading exemplary configurations and cross-correlation operation is shown conceptive.
Fig. 6 is the key diagram of synchronization timing that the received signal of leakage coaxial cable # 1 to #3 is shown.
Fig. 7 is the key diagram that the concrete example that sends regularly the processing that adjustment unit carries out is shown.
Fig. 8 is the key diagram that the concrete example that receives regularly the processing that adjustment unit carries out is shown.
Fig. 9 is the sequence chart that illustrates according to the operation of the radio communications system of embodiment.
Figure 10 is the key diagram that the exemplary sequence of paired calibration (pair-wise calibration) is shown.
Embodiment
Hereinafter, with preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.Notice that in this specification and accompanying drawing, the structural member with essentially identical function and structure is represented with identical label, and the repeat specification of these structural member is omitted.
Hereinafter will the preferred embodiments of the present invention be described with following order.
1. the configuration of radio communications system
2. background
3. the configuration of base station
4. the operation of radio communications system
5. alternative exemplary
6. sum up
＜1. the configuration of radio communications system 〉
The hereinafter configuration of describing according to the radio communications system 1 of the embodiment of the invention with reference to figure 1.
Fig. 1 is the key diagram that illustrates according to the configuration of the radio communications system 1 of the embodiment of the invention.With reference to figure 1, comprise base station 10, terminal # 1 to #3 and radio communications set 20 according to the radio communications system 1 of the embodiment of the invention.
In addition, radio communications set 20 comprises a plurality of antennas.So base station 10 can be carried out MIMO with radio communications set 20 and be communicated by letter.Notice that the distance between a plurality of antennas of radio communications set 20 can far be shorter than the distance between the leakage coaxial cable # 1 to #3 of base station 10.Particularly, distance between the antenna can be such length, this length makes in the leakage coaxial cable and regularly can be considered to identical to the reception that sends from the radio signal of a plurality of antennas, and in a plurality of antenna the reception that sends from the radio signal of a leakage coaxial cable regularly is considered to identical.
In addition, base station 10 and radio communications set 20 can be followed IEEE (Institute of Electrical and Electric Engineers) 802.11n.
＜2. background 〉
The background of present embodiment is described below with reference to Fig. 2 and Fig. 3.
Fig. 2 is the functional block diagram that the configuration of the base station 10 ' relevant with the present invention is shown.With reference to figure 2; the base station 10 ' relevant with present embodiment comprises upper strata 110, coding unit 112, transmission vector multiplication unit 114, homophony system unit 116, OFDM modulating unit 118, protection adding device 120, leading adding device 122, DAC 124, transmission analog processing unit 126, send/receive antenna switch unit 128 and leakage coaxial cable # 1 to #3 at interval, as the configuration that is used to send.
112 pairs of supplies of coding unit from the upper strata 110 transmission data encode.Then, the transmission data qualification after transmission vector multiplication unit 114 will be encoded is to a plurality of branches and multiply by the transmission vector, to be used for the MIMO transmission.
OFDM modulating unit 118 generates the time domain OFDM signal in each branch by the inverse Fourier transform of the signal after the modulation of each subcarrier.Then, each OFDM symbol of the composition ofdm signal of protection interval adding device 120 in each branch adds protection (for example, 400ns, 800ns) at interval.In addition, the head of the ofdm signal of leading adding device 122 in each branch adds and to be used for synchronous leadingly, and generates baseband transmit signals.
DAC (digital to analog converter) 124 with in each branch by the baseband transmit signals of leading adding device 122 supplies from the digital translation to the simulation.Then, sending analog processing unit 126 is high-frequency transmit signal with the transmission of the Analog Baseband in each branch conversion of signals.
Send/receive antenna switch unit 128 will send analog processing unit 126 and be connected with leakage coaxial cable # 1 to #3 when sending.As a result, be sent out as radio signal by the high-frequency transmit signal that sends in each branch that analog processing unit 126 obtains from leakage coaxial cable # 1 to #3.
In addition; the base station 10 ' relevant with present embodiment comprises upper strata 110, send/receive antenna switch unit 128, decoding unit 132, reception vector multiplication unit 134, principal solution accent unit 136, OFDM demodulating unit 138, protects and remove unit 140, lock unit 142, ADC 144, reception analog processing unit 146 and leakage coaxial cable # 1 to #3 at interval, as the configuration that is used to receive.
Send/receive antenna switch unit 128 will receive analog processing unit 146 and be connected with leakage coaxial cable # 1 to #3 when receiving.As a result, the high-frequency received signal that receives by leakage coaxial cable # 1 to #3 is supplied to and receives analog processing unit 146.
Receive analog processing unit 146 to the simulation process of the execution of the high-frequency received signal of being supplied in each branch such as amplification, filtering and down-conversion, thereby high-frequency received signal is converted to baseband receiving signals.
ADC (analog to digital converter) 144 is numeral with the baseband receiving signals from receiving analog processing unit 146 supplies in each branch from analog-converted.
Then, protection is removed unit 140 at interval and is protected at interval according to removing in the received signal of lock unit 142 detected synchronization timings from each branch, and intercepts out the OFDM symbol.
In addition, 138 pairs of OFDM demodulating units are carried out Fourier transform with respect to the time domain received signal of being removed each OFDM symbol that unit 140 intercepts out by protection at interval, thereby obtain the signal after the modulation of each subcarrier.
Signal after the modulation of principal solution accent unit 136 each subcarrier of demodulation, and obtain Bit String.Then, receive the signal times of vector multiplication unit 134 after being used for the reception vector that MIMO receives, and obtain the reception data behind the coding the demodulation in each branch.Then, the reception data behind 132 pairs of codings of decoding unit are decoded, and give upper strata 110 with decoded reception data supply.
With the communicator 20 communicated by letter in the above-mentioned base station 10 ' relevant with present embodiment in, have receiving feature because below with reference to describe former of Fig. 3 thereby by the problem of deterioration.
Fig. 3 illustrates the key diagram of the radio communications set relevant with the present invention 20 from the radio signal of each leakage coaxial cable reception of base station 10 '.With reference to figure 3, the reception of the radio signal that sends and received by radio communications set 20 from leakage coaxial cable # 1 to #3 is regularly different.This is to be caused with the different of path between the radio communications set 20 by each leakage coaxial cable # 1 to #3.
In addition, in the example depicted in fig. 3, the reception difference regularly to the radio signal that sends from leakage coaxial cable # 1 to #3 in the radio communications set 20 has exceeded protection interlude scope.So, exist in from the problem that can take place between the received signal of leakage coaxial cable # 1 to #3 to disturb.
For example, after the protection of the OFDM symbol # 1 that sends from leakage coaxial cable # 1 was received at interval, the protection of the OFDM symbol # 1 that sends from leakage coaxial cable # 3 was received at interval.Particularly, the receiving cycle of the OFDM symbol # 0 that sends from leakage coaxial cable # 3 is partly consistent with the receiving cycle of the OFDM symbol # 1 that sends from leakage coaxial cable # 1 and #2.So, may disturb from the received signal of leakage coaxial cable # 3 with between from the received signal of leakage coaxial cable # 1 and #2.
Under this background, invented base station 10 according to present embodiment.According to the transmission timing of each leakage coaxial cable in a plurality of leakage coaxial cables of base station 10 adjustment of present embodiment to radio signal, thus the deterioration of the receiving feature in the inhibition radio communications set 20.Describe the configuration of base station 10 below in detail.
＜3. the configuration of base station 〉
Fig. 4 is the functional block diagram that illustrates according to the configuration of the base station 10 of present embodiment.With reference to figure 4; base station 10 according to present embodiment comprises upper strata 110, coding unit 112, transmission vector multiplication unit 114, homophony system unit 116, OFDM modulating unit 118, protection adding device 120, leading adding device 122, DAC 124, transmission analog processing unit 126, send/receive antenna switch unit 128, transmission timing adjustment unit 154 and leakage coaxial cable # 1 to #3 at interval, as the configuration that is used to send.
In addition; base station 10 according to present embodiment comprises upper strata 110, send/receive antenna switch unit 128, decoding unit 132, reception vector multiplication unit 134, principal solution accent unit 136, OFDM demodulating unit 138, protects and remove unit 140, ADC 144, reception analog processing unit 146, lock unit/detecting unit 152, reception timing adjustment unit 156 and leakage coaxial cable # 1 to #3 at interval, as the configuration that is used to receive.
Note, distance between a plurality of antennas of assumed wireless communication means 20 is shorter than the distance between the leakage coaxial cable # 1 to #3 of base station 10 below, and aspect the path of distance leakage coaxial cable # 1 to #3, a plurality of antennas are taken as individual antenna.
(detect and receive regularly poor)
Lock unit/detecting unit 152 is carried out the synchronous detecting to the received signal that receives by each leakage coaxial cable # 1 to #3, and the difference that detects synchronization timing is as regularly poor of the reception between the leakage coaxial cable # 1 to #3.The processing of lock unit/detecting unit 152 specifically describes with reference to figure 5 and Fig. 6 hereinafter.
Fig. 5 is the key diagram that leading exemplary configurations and cross-correlation operation is shown conceptive.With reference to figure 5, leading L-STF (Short Training field, Short Training Field), L-LTF (long training field, Long Training Field), L-SIG and the data (L-Data) afterwards of comprising.
In L-STF (first synchronizing signal), the cycle is that the Known signal patterns (pattern) of 0.8 μ s is repeated 10 times.
In L-LTF (second synchronizing signal), the cycle be the Known signal patterns of 3.2 μ s latter half (1.6 μ s) afterwards, this signal mode is repeated (8 μ s altogether) 2 times.Particularly, the latter half of this signal mode that is added on the head of L-LTF serves as protection at interval.
L-SIG comprises the transmission rate of the data in being included in this frame or the information the modulation scheme.This leading time-domain signal that can be used as is stored in base station 10 and the radio communications set 20 in advance.
Lock unit/detecting unit 152 is carried out cross-correlation or the auto-correlation of L-STF, thereby detects rough synchronization timing.In addition, as shown in Figure 5, lock unit/detecting unit 152 is carried out the cross-correlation of L-LTF near the detected rough synchronization timing based on L-STF, thereby the peak that detects correlation is as synchronization timing.As shown in Figure 6,152 pairs of each received signals that receives by leakage coaxial cable # 1 to #3 of lock unit/detecting unit are carried out this Synchronous Processing.
Fig. 6 is the key diagram of synchronization timing that the received signal of leakage coaxial cable # 1 to #3 is shown.In the example depicted in fig. 6, the synchronization timing of the L-LTF of the received signal of leakage coaxial cable # 1 is t1, the synchronization timing of the L-LTF of the received signal of leakage coaxial cable # 2 is t2, and the synchronization timing of the L-LTF of the received signal of leakage coaxial cable # 3 is t3.
In addition, the synchronization timing of each received signal of lock unit/detecting unit 152 detection leakage coaxial cable # 1 to #3 is poor.For example, the poor d2 between the synchronization timing t3 of the received signal of the synchronization timing t2 of the received signal of poor d1, the leakage coaxial cable # 2 between the synchronization timing t2 of the received signal of the synchronization timing t1 of the received signal of lock unit/detecting unit 152 detection leakage coaxial cable # 1 and leakage coaxial cable # 2 and leakage coaxial cable # 3.
(sending adjustment regularly)
Basic identical from the propagation characteristic of radio communications set 20 communication path (up link) of 10 with the propagation characteristic of 10 communication paths (down link) to radio communications set 20 from the base station to the base station.Therefore, certain leakage coaxial cable that sends to from 20 pairs of radio signals of radio communications set also was considered to equal from the time that reception spent that sends to radio communications set 20 pair this radio signals of this certain leakage coaxial cable to radio signal to time that reception spent of this radio signal.
So, according to the transmission of present embodiment adjustment unit 154 poor based on by the synchronization timing of the received signal of lock unit/detecting unit 152 detected leakage coaxial cable # 1 to #3 regularly, adjust regularly from the transmission of the radio signal of leakage coaxial cable # 1 to #3.
For example, send regularly adjustment unit 154 can adjust in such a way send radio signal from leakage coaxial cable # 1 to #3 transmission regularly, make promptly that in radio communications set 20 synchronization timing to the radio signal that will send from leakage coaxial cable # 1 to #3 falls in the predetermined scope.If the scope that should be scheduled to is set to be added into the protection interlude scope of each OFDM symbol, then can suppress because the deterioration of the receiving feature that the interference between the OFDM symbol in the radio communications set 20 causes.
In addition, send regularly adjustment unit 154 and can adjust described transmissions in such a way regularly, promptly make in radio communications set 20 consistent with each other from the synchronization timing of the radio signal of leakage coaxial cable # 1 to #3 transmission.The concrete example that sends regularly the processing that adjustment unit 154 carries out is described below with reference to Fig. 7.
Fig. 7 is the key diagram that the concrete example that sends regularly the processing that adjustment unit 154 carries out is shown.Particularly, Fig. 7 shows under the difference situation as shown in Figure 6 of the synchronization timing of the received signal of leakage coaxial cable # 1 to #3 by the concrete example that sends regularly the processing that adjustment unit 154 carries out.
Since the synchronization timing of the received signal of leakage coaxial cable # 3 in the example shown in Fig. 6 the latest, so send regularly adjustment unit 154 with leakage coaxial cable # 3 to the transmission of radio signal regularly be set to be in shown in Fig. 7 before.
Then, send regularly adjustment unit 154 leakage coaxial cable # 2 regularly is adjusted into the timing that the transmission of radio signal is regularly differed d2 with leakage coaxial cable # 3 to the transmission of radio signal.Particularly, sending regularly adjustment unit 154 can be with by will the postponing from the radio signal that leakage coaxial cable # 2 sends and the difference corresponding time of d2 of leading adding device 122 supplies, and the radio signal after will postponing is supplied to DAC 124.
In addition, send regularly adjustment unit 154 leakage coaxial cable # 1 regularly is adjusted into the timing that the transmission of radio signal is regularly differed d1 with leakage coaxial cable # 2 to the transmission of radio signal.Particularly, sending regularly adjustment unit 154 can be with the corresponding time of summation with difference d1 and difference d2 of will postponing from the radio signal that leakage coaxial cable # 1 sends from leading adding device 122 supplies, and the radio signal after will postponing is supplied to DAC 124.
As the result who sends regularly the above-mentioned adjustment that adjustment unit 154 carries out, radio communications set 20 is consistent with each other from the synchronization timing (that is, receiving regularly) of each radio signal that leakage coaxial cable # 1 to #3 receives, as Fig. 7 by shown in the lower part.Thereby, can suppress the interference between the OFDM symbol that sends from leakage coaxial cable # 1 to #3 in the radio communications set 20, and improve the receiving feature of radio communications set 20.
Note, base station 10 can comprise buffer, bring in storage poor by the synchronization timing of the received signal of lock unit/detecting unit 152 detected leakage coaxial cable # 1 to #3 at each the other side communication, and send regularly adjustment unit 154 and can adjust by reference buffer and send regularly.In addition because the missionary society of the synchronization timing of the received signal of leakage coaxial cable # 1 to #3 changes when the other side's communication ends moves, so base station 10 can each when the other side's communication ends receives the content of update buffer.
(receiving adjustment regularly)
Receive regularly adjustment unit 156 and adjust of the supply of the received signal of leakage coaxial cable # 1 to #3 to lock unit/detecting unit 152 based on the difference of lock unit/detecting unit 152 detected synchronization timings.For example, receive regularly adjustment unit 156 and carry out adjustment in such a way: make that the synchronization timing of received signal of leakage coaxial cable # 1 to #3 is consistent with each other.The concrete example that receives regularly the processing that adjustment unit 156 carries out is described below with reference to Fig. 8.
Fig. 8 is the key diagram that the concrete example that receives regularly the processing that adjustment unit 156 carries out is shown.In the example depicted in fig. 8, the reception of leakage coaxial cable # 1 regularly the earliest, difference between the reception timing of leakage coaxial cable # 1 and the reception regularly of leakage coaxial cable # 2 is d1, and the difference between the reception regularly of the reception of leakage coaxial cable # 2 timing and leakage coaxial cable # 3 is d2.
In this case, because the reception of leakage coaxial cable # 3 regularly the latest, the received signal former state of leakage coaxial cable # 3 is supplied to lock unit/detecting unit 152 so receive regularly adjustment unit 156.
On the other hand, receiving regularly the synchronization timing of the received signal of adjustment unit 156 leakage coaxial cable # 2 is set to consistent with the synchronization timing of the received signal of leakage coaxial cable #3.Particularly, receiving regularly adjustment unit 156 can be with the reception constant time lag and difference corresponding time of d2 of leakage coaxial cable # 2, and the received signal after will postponing is supplied to lock unit/detecting unit 152.
Similarly, receiving regularly the synchronization timing of the received signal of adjustment unit 156 leakage coaxial cable # 1 is set to consistent with the synchronization timing of the received signal of leakage coaxial cable #3.Particularly, receiving regularly adjustment unit 156 can be with the reception constant time lag of leakage coaxial cable # 1 and the corresponding time of summation of difference d1 and difference d2, and the received signal after will postponing is supplied to lock unit/detecting unit 152.
As the result who receives regularly the above-mentioned adjustment that adjustment unit 156 carries out, the synchronization timing of each received signal of leakage coaxial cable # 1 to #3 is consistent with each other.In other words, it is regularly consistent with each other to constitute the supply of OFDM symbol of received signal of leakage coaxial cable # 1 to #3 respectively.Notice that lock unit/detecting unit 152 can be after adjusting feeds back to the difference of detected synchronization timing and receives timing adjustment unit 156.
＜4. the operation of radio communications system 〉
Configuration according to the base station 10 of present embodiment has more than been described.Hereinafter, the operation of describing according to the radio communications system 1 of present embodiment with reference to figure 9.
Fig. 9 is the sequence chart that illustrates according to the operation of the radio communications system 1 of present embodiment.With reference to figure 9, radio communications set 20 at first sends radio signal (S204).Then, leakage coaxial cable # 1 receives the radio signal that sends from radio communications set 20, and received signal is supplied to the configuration that is used to receive (S208) in the base station 10.Then, leakage coaxial cable # 2 receives the radio signal that sends from radio communications set 20, and received signal is supplied to the configuration that is used to receive (S212) in the base station 10.In addition, leakage coaxial cable # 3 receives the radio signal that sends from radio communications set 20, and received signal is supplied to the configuration that is used to receive (S216) in the base station 10.
Then, lock unit/detecting unit 152 detects reception regularly poor (S220) of leakage coaxial cable # 1 to #3 to radio signal.Then, generations such as adding device 120, leading adding device 122 will be from the transmission signal (S224) of leakage coaxial cable # 1 to #3 transmission at interval for the coding unit 112 of base station 10, transmission vector multiplication unit 114, homophony system unit 116, OFDM modulating unit 118, protection.
Then, send regularly adjustment unit 154 based on detected leakage coaxial cable # 1 to #3 in step S220 to regularly poor of the reception of radio signal, adjust from the transmission of the radio signal of leakage coaxial cable # 1 to #3 regularly (S228).Particularly, send regularly adjustment unit 154 and adjust beginning sends timing from signal to leakage coaxial cable # 1 to #3 supply.
As sending the regularly result of the above-mentioned adjustment of adjustment unit 154 execution, send signal and be supplied to leakage coaxial cable # 1 to #3, and leakage coaxial cable # 1 to #3 sends radio signal based on the transmission signal of being supplied with the order regularly opposite with reception.Particularly, send signal and be supplied to leakage coaxial cable # 1 to #3, and leakage coaxial cable # 1 to #3 is with the order transmission radio signal (S232, S236, S240) of leakage coaxial cable # 3, leakage coaxial cable # 2, leakage coaxial cable # 1 by order with leakage coaxial cable # 3, leakage coaxial cable # 2, leakage coaxial cable # 1.
In this process, the reception difference regularly of the radio signal that sends from each leakage coaxial cable # 1 to #3 reduces.As a result, can suppress the interference between the OFDM symbol that sends from leakage coaxial cable # 1 to #3 in the radio communications set 20, and improve the receiving feature of radio communications set 20.In addition and since no matter the location interval of leakage coaxial cable # 1 to #3 how the interference in the radio communications set 20 can be suppressed, so can improve the layout flexibility of leakage coaxial cable # 1 to #3.
＜5. alternative exemplary 〉
Although more than described lock unit/detecting unit 152 carry out leakage coaxial cable # 1 to #3 each received signal synchronous detecting and the difference of synchronization timing detected example as reception between the leakage coaxial cable # 1 to #3 difference regularly, the invention is not restricted to this.For example, base station 10 can receive regularly poor by using when the calibration in pairs to send and to detect from the calibration data bag that radio communications set 20 receives to radio communications set 20.
MIMO communication roughly is divided into two classes: do not carry out multiply by sending vectorial open loop class and multiply by the closed loop class that sends vector in the transmitting terminal execution at transmitting terminal.In the closed loop class, the RF circuit (send analog processing unit 126, receive analog processing unit 146) and the calibration of antenna (leakage coaxial cable) are performed.
Wherein, collimation technique has in base station 10 in self-contained mode and carries out the self calibration of calibration and by carry out the paired calibration that calibrating sequence is carried out calibration in advance between base station 10 and radio communications set 20.Figure 10 shows the exemplary sequence of paired calibration.
Figure 10 is the key diagram that the exemplary sequence of paired calibration is shown.In calibrating in pairs, base station 10 and radio communications set 20 orders are from their leakage coaxial cable or the known calibration data bag of antenna transmission.
Particularly, with reference to Figure 10, when base station 10 when leakage coaxial cable # 1 sends the calibration data bag, radio communications set 20 sends the calibration data bag in response to the calibration data bag that is sent from antenna #1.In addition, after leakage coaxial cable # 2 sent the calibration data bag, radio communications set 20 sent the calibration data bag from antenna # 2 in base station 10.
From to known from receiving radio communications set 20 of the calibration data bag of leakage coaxial cable # 1 to the time interval of the transmission of calibration data bag.Equally, to known from receiving radio communications set 20 of the calibration data bag of leakage coaxial cable # 2 to the time interval of the transmission of calibration data bag.
In addition, base station 10 can be obtained from the sending to from the time span L1 of the reception of 20 pairs of calibration data bags of radio system the calibration data bag from leakage coaxial cable #1.Equally, base station 10 can be obtained from the sending to from the time span L2 of the reception of 20 pairs of calibration data bags of radio communications set the calibration data bag from leakage coaxial cable # 2.
So base station 10 can be based on receiving each calibration data bag from radio communications set 20, come regularly poor of reception between the sense terminals # 1 to #3.For example, base station 10 can be by replacing with above-mentioned time span L1 and L2 poor regularly and between the reception of leakage coaxial cable # 2 regularly of reception that " (L2-L1)/2 " calculate leakage coaxial cable #1.The reception that leakage coaxial cable # 1 can be calculated by same mode in base station 10 regularly and the reception of the reception of leakage coaxial cable # 3 poor, leakage coaxial cable # 2 regularly regularly and the difference between the reception of leakage coaxial cable # 3 regularly etc. (although not describing in detail).Note,, can carry out and be used to adjust the antenna calibration that sends timing although top the description is not at first to be used to detect the antenna calibration that receives regularly poor (adjust and send regularly) be used to adjust yet and send situation regularly.
＜6. sum up
As mentioned above, according to present embodiment, regularly poor of the reception that can reduce the radio signal that sends from leakage coaxial cable # 1 to #3 respectively in the radio communications set 20.Thereby, can suppress the interference between the OFDM symbol that sends from leakage coaxial cable # 1 to #3 in the radio communications set 20, thereby improve the receiving feature of radio communications set 20.So, can improve the layout flexibility of leakage coaxial cable # 1 to #3.
In addition, above advantage realizes by lock unit/detecting unit 152 is attached in the base station 10 with transmission timing adjustment unit 154.So present embodiment has and unnecessary specific function is attached to real advantage in the radio communications set 20.
Although more than be described in detail with reference to the attached drawings the preferred embodiments of the present invention, the invention is not restricted to this.It should be appreciated by those skilled in the art that under the condition of the scope that does not break away from claims and equivalent thereof, can make various modifications, combination, sub-portfolio and change based on designing requirement and other factors.
For example, use the leading situation that packet synchronous or that be used to calibrate detects the reception timing of carrying out, the invention is not restricted to this although described among the above embodiment.Example as an alternative, base station 10 can be used particular sequence to detect and receive regularly.
In addition, although described the situation that base station 10 comprises three leakage coaxial cables among the above embodiment, the invention is not restricted to this.For example, base station 10 can comprise two leakage coaxial cables or four above leakage coaxial cables.In this case, base station 10 can by with the foregoing description in essentially identical mode adjust each leakage coaxial cable regularly to the transmission of radio signal, suppress the interference in the radio communications set 20.
In addition, the step in the unnecessary processing of always carrying out the radio communications system 1 in this specification with chronological order according to the sequence shown in the sequence chart.For example, the step in the processing of radio communications system 1 can be to carry out or to be executed in parallel with orders different shown in the sequence chart.
In addition, can create the computer program that impels the hardware such as CPU, ROM and RAM that is included in the base station 10 to carry out the function that is equal to each element in the above-mentioned base station 10.In addition, the storage medium of storing this computer program can be provided.
The application comprises and on the September 25th, 2009 of relevant theme of disclosed content in the Japanese priority patent application JP 2009-220479 that Japan Patent office submits, and its full content is incorporated into this by reference.
Claims (9)
1. radio communications set comprises:
A plurality of leakage coaxial cables, described leakage coaxial cable sends and receives radio signals;
Detecting unit, described detecting unit detect between described a plurality of leakage coaxial cable sending from regularly poor of the reception of the radio signal of another radio communications set; And
Send regularly adjustment unit, regularly adjustment unit is based on detected described regularly poor that receive of described detecting unit in described transmission, and the transmission of adjusting the radio signal that will be respectively sends from described a plurality of leakage coaxial cables regularly.
2. radio communications set according to claim 1, wherein
The described adjustment unit that sends is regularly adjusted described the transmission regularly in such a way: make in this another radio communications set the reception difference regularly to the radio signal that will be respectively sends from described a plurality of leakage coaxial cables be in the preset range.
3. radio communications set according to claim 2, wherein
The described adjustment unit that sends is regularly adjusted described the transmission regularly as follows: make in this another radio communications set the reception difference regularly to the radio signal that will be respectively sends from described a plurality of leakage coaxial cables be in the protection interlude scope that is added into each OFDM symbol.
4. radio communications set according to claim 3, wherein
The described adjustment unit that sends is regularly adjusted described the transmission regularly in a certain way: make in this another radio communications set to the reception of the radio signal that will be respectively sends from described a plurality of leakage coaxial cables regularly consistent with each other.
5. radio communications set according to claim 4, wherein
Described radio communications set is carried out the antenna calibration of another radio communications set therewith, and
In described antenna calibration,
Based on coming the response of another radio communications set since then, calibrating signal is sent in proper order from described a plurality of leakage coaxial cables, and
Described detecting unit detects described regularly poor that receive based on coming the response in response to the described calibrating signal that sends in proper order from described a plurality of leakage coaxial cables of another radio communications set since then.
6. radio communications set according to claim 3 also comprises:
Lock unit, described lock unit detect each synchronization timing of the received signal that is received by described a plurality of leakage coaxial cables, wherein
Described detecting unit detects poor by the synchronization timing of the detected received signal of described lock unit, receives regularly poor as described.
7. radio communications set according to claim 6 also comprises:
Receive regularly adjustment unit, described reception regularly adjustment unit is supplied to the timing of described lock unit based on detected described each that receives in the received signal that difference adjustment regularly will receive by described a plurality of leakage coaxial cables of described detecting unit.
8. radio communications system comprises:
First radio communications set, described first radio communications set comprises a plurality of antennas; And
Second radio communications set, described second radio communications set comprises:
A plurality of leakage coaxial cables, described leakage coaxial cable sends and receives radio signals;
Detecting unit, described detecting unit detect between described a plurality of leakage coaxial cable sending from regularly poor of the reception of the radio signal of described first radio communications set; And
Send regularly adjustment unit, regularly adjustment unit is based on detected described regularly poor that receive of described detecting unit in described transmission, and the transmission of adjusting the radio signal that will be respectively sends from described a plurality of leakage coaxial cables regularly.
9. radio communication method may further comprise the steps:
Receive the radio signal that sends from another radio communications set by a plurality of leakage coaxial cables;
Detect between described a plurality of leakage coaxial cable regularly poor of the reception of described radio signal; And
Based on the described transmission that receives the radio signal that difference adjustment regularly will be respectively sends from described a plurality of leakage coaxial cables regularly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-220479 | 2009-09-25 | ||
| JP2009220479A JP2011071704A (en) | 2009-09-25 | 2009-09-25 | Radio communication device, radio communication system, and radio communication method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102035581A true CN102035581A (en) | 2011-04-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2010102895338A Pending CN102035581A (en) | 2009-09-25 | 2010-09-19 | Radio communication device, radio communication system, and radio communication method |
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|---|---|
| US (1) | US8452240B2 (en) |
| JP (1) | JP2011071704A (en) |
| CN (1) | CN102035581A (en) |
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| CN108352858A (en) * | 2015-11-10 | 2018-07-31 | 三菱电机株式会社 | Information-communication device, information communication system and information communicating method |
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| IT1403065B1 (en) | 2010-12-01 | 2013-10-04 | Andrew Wireless Systems Gmbh | DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS. |
| US20120282889A1 (en) * | 2010-01-12 | 2012-11-08 | Sumitomo Electric Industries, Ltd | Base station device |
| JP5484947B2 (en) * | 2010-02-18 | 2014-05-07 | 京セラ株式会社 | Base station, communication system and communication method |
| JP5372081B2 (en) * | 2011-07-28 | 2013-12-18 | 東芝テック株式会社 | Wireless communication system |
| US8902877B2 (en) * | 2011-08-22 | 2014-12-02 | Broadcom Corporation | Method and system for reducing power consumption in wireless communications by adjusting communication intervals |
| JP5796448B2 (en) | 2011-10-07 | 2015-10-21 | ソニー株式会社 | Wireless communication apparatus, wireless communication method, and wireless communication system |
| JP5838470B2 (en) * | 2011-10-14 | 2016-01-06 | 株式会社国際電気通信基礎技術研究所 | Wireless communication apparatus and wireless communication method |
| US9780447B2 (en) * | 2012-01-24 | 2017-10-03 | Commscope Technologies Llc | Multi-element antenna calibration technique |
| EP2849518B1 (en) | 2012-05-10 | 2019-12-18 | Sony Corporation | Communication control device, communication control method, and system |
| WO2013183331A1 (en) | 2012-06-05 | 2013-12-12 | ソニー株式会社 | Communication controller, base station, terminal equipment and communication control method |
| WO2014002585A1 (en) | 2012-06-27 | 2014-01-03 | ソニー株式会社 | Communication control device, communication control method and communication device |
| EP3579600B1 (en) | 2012-06-27 | 2023-03-22 | Sony Group Corporation | Communication control device, communication control method and communication device |
| CN104396331B (en) | 2012-07-05 | 2018-12-04 | 索尼公司 | Communication control unit, communication control method, program, terminal installation and communication control system |
| BR112015003706B1 (en) | 2012-08-31 | 2022-11-16 | Sony Corporation | APPARATUS, METHOD AND COMMUNICATION CONTROL SYSTEM, TERMINAL APPARATUS, AND COMPUTER READABLE NON-TRANSITORY STORAGE MEDIA |
| US9712212B2 (en) | 2015-04-03 | 2017-07-18 | Wlanjv, Inc. | Multiple service distributed-antenna system |
| CN107360113B (en) * | 2017-07-25 | 2019-11-22 | 深圳芯之联科技有限公司 | A kind of judgement of bandwidth and symbol timing synchronization method and device |
| US10470180B2 (en) | 2018-01-24 | 2019-11-05 | Shure Acquisition Holdings, Inc. | Wireless microphone system |
| GB2573294B (en) * | 2018-04-30 | 2021-10-06 | Sony Interactive Entertainment Inc | System and Method of robot control |
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| CN1815909A (en) * | 2005-01-31 | 2006-08-09 | 株式会社日立国际电气 | System and method for synchronization between base stations |
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| JP2006270880A (en) | 2005-03-25 | 2006-10-05 | Orion Denki Kk | Video signal receiving and displaying apparatus, and screen display control method corresponding to video signal level |
| US20090279572A1 (en) * | 2008-05-07 | 2009-11-12 | Canon Kabushiki Kaisha | Transmission apparatus and method |
| JP2010058908A (en) * | 2008-09-04 | 2010-03-18 | Toshiba Tec Corp | Article management system |
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2010
- 2010-09-16 US US12/883,870 patent/US8452240B2/en not_active Expired - Fee Related
- 2010-09-19 CN CN2010102895338A patent/CN102035581A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1815909A (en) * | 2005-01-31 | 2006-08-09 | 株式会社日立国际电气 | System and method for synchronization between base stations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108352858A (en) * | 2015-11-10 | 2018-07-31 | 三菱电机株式会社 | Information-communication device, information communication system and information communicating method |
Also Published As
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| US8452240B2 (en) | 2013-05-28 |
| US20110076965A1 (en) | 2011-03-31 |
| JP2011071704A (en) | 2011-04-07 |
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Application publication date: 20110427 |